<template>
  <div class="login-container">
    <el-form
      ref="ref_loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      autocomplete="on"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title" style="letter-spacing: 3px">寝室自动开门系统</h3>
      </div>

      <el-form-item prop="username">
        <!-- <span class="svg-container">
          <svg-icon icon-class="user" />
        </span> -->
        <el-input
          ref="ref_username"
          v-model="loginForm.username"
          placeholder="请输入用户名"
          name="username"
          type="text"
          tabindex="1"
          autocomplete="on"
          size="medium"
        />
      </el-form-item>

      <el-tooltip
        v-model="capsTooltip"
        content="Caps lock is On"
        placement="right"
        manual
      >
        <el-form-item prop="password">
          <!-- <span class="svg-container">
            <svg-icon icon-class="password" />
          </span> -->
          <el-input
            :key="passwordType"
            ref="ref_password"
            v-model="loginForm.password"
            :type="passwordType"
            placeholder="请输入密码"
            name="password"
            tabindex="2"
            autocomplete="on"
            @keyup="checkCapslock"
            @blur="capsTooltip = false"
            @keyup.enter="handleLogin"
          />
          <span class="show-pwd" @click="showPwd">
            <!-- <svg-icon
              :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'"
            /> -->
          </span>
        </el-form-item>
      </el-tooltip>

      <div style="text-align: center">
        <el-button
          v-waves
          :loading="loading"
          type="primary"
          style="width: 80%"
          @click.prevent="handleLogin"
        >
          立即登录
        </el-button>
      </div>
    </el-form>
  </div>
</template>

<script>
import { useStore } from 'vuex'
import { useRouter } from 'vue-router'
import { validUsername } from '@/utils/validate'
import { toRefs, reactive, onMounted, nextTick, watch } from 'vue'
import { ElMessage } from 'element-plus'
import { _throttle } from '@/utils/throttle'

export default {
  name: 'Login',
  setup() {
    const store = useStore()
    const router = useRouter()

    const validateUsername = (rule, value, callback) => {
      if (!validUsername(value)) {
        callback(new Error('请输入正确的用户名！'))
      } else {
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
      if (value.length < 6) {
        callback(new Error('请输入有效的密码！'))
      } else {
        callback()
      }
    }
    const data = reactive({
      ref_loginForm: null,
      ref_username: null,
      ref_password: null,
      loginForm: {
        username: '',
        password: ''
      },
      loginRules: {
        username: [
          { required: true, trigger: 'blur', validator: validateUsername }
        ],
        password: [
          { required: true, trigger: 'blur', validator: validatePassword }
        ]
      },
      passwordType: 'password',
      capsTooltip: false,
      loading: false,
      showDialog: false,
      redirect: undefined,
      otherQuery: {}
    })

    const {
      ref_loginForm,
      ref_username,
      ref_password,
      loginForm,
      capsTooltip,
      passwordType,
      loading
    } = {
      ...toRefs(data)
    }

    onMounted(() => {
      if (loginForm.value.username === '') {
        ref_username.value.focus()
      } else if (loginForm.value.password === '') {
        ref_password.value.focus()
      }
    })

    const checkCapslock = (e) => {
      const { key } = e
      capsTooltip.value = key && key.length === 1 && key >= 'A' && key <= 'Z'
    }

    const showPwd = () => {
      if (passwordType.value === 'password') {
        passwordType.value = ''
      } else {
        passwordType.value = 'password'
      }
      nextTick(() => {
        ref_password.focus()
      })
    }

    const handleLogin = _throttle(() => {
      ref_loginForm.value.validate((valid) => {
        if (valid) {
          loading.value = true
          // window.console.log(valid, loginForm.value)
          store
            .dispatch('user/login', loginForm.value)
            .then(() => {
              const query = router.currentRoute.value.query
              // window.console.log(query)
              loading.value = false
              router.push({
                path: query.redirect || '/',
                query: getOtherQuery(query)
              })
            })
            .catch(() => {
              ElMessage({
                message: '登陆失败，请检查用户名密码后重新尝试！',
                type: 'error',
                duration: 2000
              })
              loginForm.value.password = ''
              loading.value = false
            })
        } else {
          // console.log('error submit!!')
          return false
        }
      })
    }, 200)

    const getOtherQuery = (query) => {
      return Object.keys(query).reduce((acc, cur) => {
        if (cur !== 'redirect') {
          acc[cur] = query[cur]
        }
        return acc
      }, {})
    }

    return {
      ...toRefs(data),
      ref_loginForm,
      ref_username,
      ref_password,
      checkCapslock,
      showPwd,
      handleLogin
    }
  }
}
</script>

<style lang="scss">
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

$bg: #283443;
$light_gray: #fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
    width: 80%;
    margin: 35px auto;
  }
}
</style>

<style lang="scss" scoped>
$bg: #2d3a4b;
$dark_gray: #889aa4;
$light_gray: #eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 80%;
    max-width: 520px;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }

  .thirdparty-button {
    position: absolute;
    right: 0;
    bottom: 6px;
  }

  @media only screen and (max-width: 470px) {
    .thirdparty-button {
      display: none;
    }
  }
}
</style>
